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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e5cede80fd000986baef03260783d49db6a5202388972471f2119f72cd6a316' 
  AND token = '5WnNUnukWqrrLrIg/3meIFpHHOKxGOxkUuI6sG8B3CM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}